[talkingcars]

Do you know why they don't work?

Can you hear the motor running when you activate the switch?
You may have to open the bonnet to hear, the bottle is at the front drivers side.

Is there water in the bottle?

If yes to both of these then are you in a hatch, is the back working?

If still yes try disconnecting the hose from the actual jets on the underside of the bonnet, if you get water then the jets are blocked.

I'd spend a few minutes checking the simple bits.